1. NUMBERS TO REMEMBER ABOUT EARLY CHILDHOOD DEVELOPMENT 700 700 PER SECOND 18 18 MONTHS 90–100 90-100% 4-9 4-9 DOLLARS This feature highlights numbers to remember about the development of young children. Learn how the numbers illustrate such concepts as the importance of early childhood to the learning, behavior, and health of later life and why getting things right the first time is easier and more effective than trying to fix them later. This feature is also available in a web-based slideshow format at http://developingchild.harvard.edu/resources/multimedia/interactive_features/fivenumbers/ http://developingchild.harvard.edu/resources/multimedia/interactive_features/fivenumbers/

2. www.developingchild.harvard.edu The early years matter because, in the first few years of life, 700 new neural connections are formed every second. Neural connections are formed through the interaction of genes and a baby’s environment and experiences, especially “serve and return” interaction with adults, or what developmental researchers call contingent reciprocity. These are the connections that build brain architecture – the foundation upon which all later learning, behavior, and health depend. Image source: Conel, JL. The postnatal development of the human cerebral cortex. Cambridge, Mass: Harvard University Press, 1959

3. www.developingchild.harvard.edu Early experiences and the environments in which children develop in their earliest years can have lasting impact on later success in school and life. Barriers to children’s educational achievement start early, and continue to grow without intervention. Differences in the size of children’s vocabulary first appear at 18 months of age, based on whether they were born into a family with high education and income or low education and income. By age 3, children with college-educated parents or primary caregivers had vocabularies 2 to 3 times larger than those whose parents had not completed high school. By the time these children reach school, they are already behind their peers unless they are engaged in a language-rich environment early in life. Source: Hart, B., & Risley, T. (1995). Meaningful differences in the everyday experiences of young American children. Baltimore, MD: Brookes.

4. www.developingchild.harvard.edu Significant adversity impairs development in the first three years of life—and the more adversity a child faces, the greater the odds of a developmental delay. In fact, risk factors such as poverty, caregiver mental illness, child maltreatment, single parent, and low maternal education have a cumulative impact: children exposed to 6 or 7 of these risks face a 90-100% likelihood of having one or more delays in their cognitive, language, or emotional development. Source: Barth, et al. (2008)

5. www.developingchild.harvard.edu Providing young children with a healthy environment in which to learn and grow is not only good for their development—economists have also shown that high-quality early childhood programs bring impressive returns on investment to the public. Three of the of the most rigorous long-term studies found a range of returns between $4 and $9 for every dollar invested in early learning programs for low-income children. Program participants followed into adulthood benefited from increased earnings while the public saw returns in the form of reduced special education, welfare, and crime costs, and increased tax revenues from program participants later in life. Sources: Masse, L. and Barnett, W.S., A Benefit Cost Analysis of the Abecedarian Early Childhood Intervention (2002); Karoly et al., Early Childhood Interventions: Proven Results, Future Promise (2005); Heckman et al., The Effect of the Perry Preschool Program on the Cognitive and Non- Cognitive Skills of its Participants (2009)

6. 700 700 PER SECOND 18 18 MONTHS 90 – 100 90 – 100 % 4 – 9 4 – 9 DOLLARS 1. Getting things right the first time is easier and more effective than trying to fix them later. 2.Early childhood matter because experiences early in life can have a lasting impact on later learning, behavior, and health. 3.Highly specialized interventions are needed as early as possible for children experiencing stress. 4.All of society benefits from investments in early childhood programs. WHAT THESE NUMBERS TELL US